September weather forecastHakodate, Japan
September
Weather in September
September in Hakodate sees an appreciable shift in weather as temperatures cool off to 17°C (62.6°F) to 20.9°C (69.6°F), ushering in the beginning of the autumn season. Hakodate's breathtaking autumnal hues famously start to emerge around this time. Commendably, there's a decrease in rainfall from the high levels in August, making outdoor activities more pleasurable. As September progresses, the weather tends to become progressively more comfortable and less humid than the previous month. Significantly, the cooler days and nights further give a feel of the incoming autumn season.Temperature
The advent of September brings an average high-temperature of an agreeable 20.9°C (69.6°F), exhibiting minor difference from the previous month. Hakodate reports an average low temperature of 17°C (62.6°F) in September, a minor decrease from the day's highs.Humidity
In Hakodate, the average relative humidity in September is 79%.Rainfall
In September, the rain falls for 9.4 days. Throughout September, 16mm (0.63") of precipitation is accumulated. In Hakodate, during the entire year, the rain falls for 112.7 days and collects up to 203mm (7.99") of precipitation.Snowfall
In Hakodate, snow does not fall in May through October.Sea temperature
In Hakodate, in September, the average water temperature is 20.9°C (69.6°F).Note: Swimming is not a pleasurable activity for the majority in water at 20.9°C (69.6°F). Breathing control gets harder as the water temperature dips from 21°C (69.8°F) to 15°C (59°F).
Daylight
In Hakodate, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 05:03 and sunset at 18:11. On the last day of the month, sunrise is at 05:33 and sunset at 17:21 JST.
Sunshine
The average sunshine in September is 7.9h.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: An average UV index of 5 in September transforms into this advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hakodate, Japan
- Average high temperature in September: 20.9°C
The warmest month (with the highest average high temperature) is August (23.4°C).
The month with the lowest average high temperature is January (-0.1°C).
- Average low temperature in September: 17°C
The month with the highest average low temperature is August (19.6°C).
The coldest month (with the lowest average low temperature) is February (-3.5°C).
Average pressure in September
Hakodate, Japan
- Average pressure in September: 1013.7mbar
The month with the highest atmospheric pressure is November (1017mbar).
The month with the lowest atmospheric pressure is July (1008.8mbar).
Average wind speed in September
Hakodate, Japan
- Average wind speed in September: 14.3km/h
The windiest month (with the highest average wind speed) is December (24.3km/h).
The calmest month (with the lowest average wind speed) is July (12.2km/h).
Average humidity in September
Hakodate, Japan
- Average humidity in September: 79%
The month with the highest relative humidity is July (89%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Hakodate, Japan
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is August (25mm).
The driest month (with the least rainfall) is May (12mm).
Average rainfall days in September
Hakodate, Japan
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is July (13 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in September
Hakodate, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (52mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Hakodate, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Hakodate, Japan
- Average sea temperature in September: 20.9°C
The best month for swimming (with the highest average sea temperature) is August (21.8°C).
The coldest month (with the lowest average sea temperature) is March (4.9°C).
Average daylight in September /
Average sunshine in September
Hakodate, Japan
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 7h and 54min
The month with the most sunshine is May (Average sunshine: 8h and 48min).
The months with the least sunshine are January and February (Average sunshine: 3h and 6min).
Average sunshine days in September
Hakodate, Japan
- Average sunshine days in September: 15.5 days
The months with the most sunshine days are May and October (17.3 days).
The month with the least sunshine days is February (9.3 days).
Average UV index in September
Hakodate, Japan
- Average UV index in September: 5
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Hakodate, Japan
- Average cloud cover in September: 38
The month with the most cloud cover is January (Cloud cover 69).
The months with the least cloud cover are September and October (Cloud cover 38).
Average visibility in September
Hakodate, Japan
- Average visibility in September: 10km
The months with the highest visibility are September and October (10km).
The month with the lowest visibility is July (8km).
